Najibullah Zazi is arrested by federal agents in connection with an investigation into an alleged al Qaeda plot at his home shortly before 10pm Saturday night in Aurora, Colorado. His father was also arrested.

ABC News

The FBI arrested three men overnight on charges they lied to federal agents during an investigation of a terror plot against New York City that authorities say was "the real deal."

Agents in Denver arrested Najibullah Zazi, a 24-year old airport shuttle driver, who authorities say appears to be the ringleader of the alleged plot. Also charged with lying to the FBI was Zazi's father, Mohammed Zazi.

In New York, the FBI arrested the leader of a Queens mosque, Ahmad Afzali, who authorities allege had been a New York police department informant but "went bad" and tipped off Zazi, his father and others to the investigation.

null

Afzali's alleged double cross compromised the case and led the FBI to move in on the suspects much earlier than they had wanted and led to extreme tensions between the Denver office of the FBI and the NYPD. One law enforcement official said the NYPD had been specifically asked not to reveal the investigation to its informants, but went ahead anyway.

Later, Zazi admitted the notes were his and that he attended an al Qaeda training camp in Pakistan and received instructions on weapons and explosives.

Law enforcement and intelligence officials say the case began in 2008 when the CIA twice picked up on Zazi's presence in the Pakistani city of Peshawar, a place often used by al Qaeda to arrange meetings with foreigners.

Zazi maintained publicly that he had no ties to al Qaeda and had gone to Peshawar only to visit his wife.

According to the FBI affidavits, Zazi went to Peshawar in Aug. 2008 and again in Jan. 2009.

Law enforcement officials told ABCNews.com that electronic intercepts revealed Zazi had sent text messages suggesting, in code, the plot was nearing the attack stage. "The wedding cake is ready," Zazi allegedly wrote.

The three men are scheduled to appear in court Monday morning on the charges, which authorities say are designed to keep them in custody while more serious charges are considered.

At 9:30pm Saturday, six black SUV's with red and blue flashing lights rushed into a suburban housing complex in Aurora, Colorado, and a group of FBI agents climbed three flights to Zazi's apartment.

The officers remained inside for about five minutes. They first brought out Zazi's father, in handcuffs, escorted by two agents, and placed him in a waiting vehicle. Next, Najibullah Zazi , in handcuffs, surrounded by agents, was brought down, placed in a second car and the caravan sped off.

Zazi had been scheduled to spend a fourth day Saturday being questioned by the FBI but his lawyer canceled the session.

"He has taken the day to consult with his client," Aiello said.

Late Saturday night, Aiello said of Najibullah and Muhommed Zazi's arrests, "Their attorney, Arthur Folsom, is with them at FBI offices in Denver, Colorado. Specific charges are unavailable at this time."